Protected metal article



Ju e 30, 1931. v J. H. YOUNG 1,812,732

PROTECTED METAL ARTICLE Filed Sept. 20. 1e29,

I I lam-(2 a M W 57 glmwewme,

Patented June 30, 1931 UNITED STATES PATENT OFFICE JAMES HOWARD YOUNG, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOB TO H. H. ROBERT- SON COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYL- -VANIA PROTECTED METAL ARTICLE Application filed September 20, 1929. Serial No. 393,956.

This invention relates to a protected metal article of'the character described in United States Patent No. 1,432,512 granted to me October 17, 1922.

Protected metal articles of the character described employ a fire-resisting asphalt composed of a mlxture of asphalt and chlorinated napthalene as a saturant for the asbestos felt or like fibrous layer or layers afiixed to the metal article.

This fire-resisting asphalt is efficient for resisting fire and for preventing the spread of a fire if one isstarted, but is open to the objection of losing its efiiciency after the protected metal article has been in service and exposed to the weather for relatively long periods. of time, due to the slow emporation of the chlorinated napthalene.

As a result of this slow evaporation of the chlorinated napthalene, the life and usefulness of the asphalt-protected metal article and particularly an asphalt-protected metal sheet used in the construction of buildin s for the roof and side walls, is materially shortened, because the adhesion of the felt layer to the metal sheet is weakened in time, which permits the felt layer to shrink and pull away from the edges of the metal sheet, which is usually of steel, and expose the same to the corrosive action of the weather and acid and alkali fumes.

Furthermore, when the rotected metal sheet is corrugated, the felt ayer in shrinking pulls away from the bottom and side walls of the valleys in the corrugated metal sheet, and the felt layer is then liable to be torn away in patches by high winds, leaving the metal sheet exposed for parts of its surface.

The present invention has for its object to provide a protected metal article of the character described which is not open to the objections recited and one in which the felt layer is nonshrinkable or substantially so under conditions of use for long periods of time, and which therefore is a superior and more ecnomical product for use as a roof or side wall in buildings.

To this end, the felt layer is saturated or impregnated with a fire-resisting andsubstantially non-granulating asphalt composed of asphalt and chlorinated dior poly-phenyl, which saturant is" not only a better fire resistant butalso is substantially permanent,

in that practically no evaporation loss on long exposure is experienced, and further said fireresisting saturant seems permanently miscible with asphalts.

The particular features of the invention will be pointed out in the claims at the end of this specification.

Fig. l is a plan of a protected metal article embodyin the invention, with parts broken away, and

Fig. 2, a section on the line 2-2, Fig. 1.

Referring to the drawings, (1. represents the metal article to be protected, which may be a bar, sheet, or other article, and which is represented in the form of a sheet and will be hereinafter so designated.

The metal sheet a herein shown iscovered with a coating or layer 6 of asphalt or like bituminous material, referably a relatively hard or high-me ting point asphalt.

The metal sheet a has afiixed to it a layer a of fibrous material, such as asbestos paper or felt, which in accordance with this invention is saturated with a substantially permanent fire-resisting, substantially nongranulating asphalt, composed of asphalt fiuxed with chlorinated poly-phenyl, such as dior other poly-phenyls, and this saturated felt layer 0 preferably has aflixed to it 3.

The chlorinated poly-phenyl is readily.

miscible with the asphalt and when mixed with the same produces a substantially permanent fire-resisting asphalt which readily.

penetrates into the felt layer 0, and enables the said layer when afiixed to the metal sheet by the bonding of the asphalt saturant with the asphalt layer b on the metal sheet, to form a substantially permanent protective fibrous layer for the metal sheet a under conditions of use for a lon of time, and one whose adhesion to the metal sheet is-not materiallydiminished by-granulation of the asphalt due to improper solubilityand evaporation, but is such as to resist contraction of the fibrous or felt layer and exposure of the edges of the metal sheet,

and also when the metal sheeta is a corrugated sheet, resists separation of the felt layer from the bottom and side walls of the valleys of the corrugations of said metal sheet, and avoids in ury to the protected metal sheet .under conditlons of use.

The protected metal sheethaving its felt or fibrous layer c'saturated with the improved fire-resisting and substantially nongranulating asphalt afi'ords superior fire protection for long periods of use, and the fireprotection may be increased b incor orating the chlorinated polyheny with t e asphalt forming the inner ayer b or the outer layer d.

The fire-resistin asphalt has the pro of localizing the ame to that area 0 the protected metal sheet, which is heated and oes not carry the flame to parts of the surface outside of the heated zone and in this sense the saturant does not support combustion and is fire-resisting.

In addition, the improved fire-resisting ashalt does not deteriorate on exposure for ong periods of time and the adhesive qualities of the asphalt is not weakened bygranulation of: the asphalt due to evaporation or to slow precipitation of component parts.

The term poly-phenyl as used herein is employed to designate not only diphenyl but also those higher-boiling point roducts, which are produced when dip enyl is formed by passing ben'zol vapors over heatperiod I layer of fire-resisting asphalt composed of asphalt and chlorinated poly-phenyl.

n testimony whereof, I have signed my name to this specification.

JAMES HOWARD YOUNG.

erty

ed catalysts under pressure, and which are commonly known to the industry as high boilers or poly-phenyls, the exact composl tion of which isv at present unknown but.- which react with chlorine to form ChlOIlIlated products similar to chlorinated di pheny By the term asphalt as used in the claims I desire to include bituminous products of similar nature to asphalt, such as stearin pitch and the like.

What is claimed is:

1. A. protected metal article comprising 

